Used on boeing 707 power plant installation,rear engine mount. 3b thread class right-hand 16 thread quantity per inch magnetic particle inspect 100% per astm e 1444. acceptance criteria per sps-1-700, level 11. satisfactory parts to be dyed green silver surface treated
3b thread class right-hand 13 thread quantity per inch modification will be carbon steel, zink plated replaces MS17829-8c zinc except insert surface treated